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Acta Parasitologica, Vol.44, No. 4, 1999, 215-221
Grabda-Kazubska Bozena (1) , Bayssade-Dufour Christiane (2) - Comparative chaetotaxy of five species of plagiorchiid cercariae, genera Leptophallus, Metaleptophallus, Macrodera and Paralepoderma.

(1) W. Stefanski Institute of Parasitology, Polish Academy of Sciences, Twarda 51/55, 00-818 Warszawa, Poland; (2) Museum National d'Histoire Naturelle, Laboratoire de Biologie Parasitaire, 61 rue Buffon, 75 005 Paris, France

The chaetotaxy of five species of plagiorchiid cercariae - Leptophallus nigrovenosus, Metaleptophallus gracillimus, Macrodera longicollis, Paralepoderma brumpti and P. progeneticum, is described and compared. A great similarity in the distribution of sensillae in all the species examined, especially in cephalic rings CI-IV, as well as in dorsal and ventral rows, suggests close affinities among these species. The variation in the pattern of chaetotaxy observed in P. brumpti and P. progeneticum (presence of 1-3 sensillae of the CI ring inside the oral cavity and numerous sensillae on the ventral sucker) seems to be connected with obligatory progenesis in the life cycle of these species.

KEY WORDS: Chaetotaxy, plagiorchiid cercariae, Leptophallus, Metaleptophallus, Macrodera, Paralepoderma
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